Release note (sql change, bug fix): Previously, `timestamp/timestamptz -
timestamp/timestamptz` operators would normalize the interval into
months, days, H:M:S (in older versions, this may be just H:M:S).

This could result in an incorrect result:
```
> select '2020-01-01'::timestamptz - '2018-01-01';
     ?column?
-------------------
  2 years 10 days
```
This has now been fixed such that it is only normalized into
days/H:M:S. This is now more postgres compatible.

Release note (sql change, bug fix): Previously, the `age` builtin would
incorrectly normalize months and days based on 30 days a month (in older
versions this may be just H:M:S).

This can give an incorrect result, e.g.
```
> select age('2020-01-01'::timestamptz, '2018-01-01');
     ?column?
-------------------
  2 years 10 days
```

This is not the most accurate it could be as `age` can use the given
timestamptz arguments to be more accurate.
This is now more postgres compatible.